4-bolt 400
Moderator: John_Heard
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4-bolt 400
i hear that there is a problem with the 4-bolt 400 SBC what is it? thanks.
mikes machine shop 785-233-1252
- CoMax Racing
- Posts: 169
- Joined: Sat Oct 01, 2005 4:40 pm
- Location: Edmonton Alberta Canada
400 sb problems
Well, from what I've heard, one of the problems with them is the main webs. They have been known to crack. A lot of guys will get a 2 bolt block at fit 4-bolt caps to it.
Re: 400 sb problems
I heard the samethingCoMax Racing wrote:Well, from what I've heard, one of the problems with them is the main webs. They have been known to crack. A lot of guys will get a 2 bolt block at fit 4-bolt caps to it.
Im getting ready to build a 2 bolt 400 Im probably gonna stud it or just use some good ARP bolts but Im only looking to make about 500 HP Ive built one before so Im hoping it will work again. We built a 421 with a stock 4 bolt block and caps and made around 700 hp never had a lower end problem but it was N/A maybe a power adder would hurt it.
Re: 4-bolt 400
The 509 casting block is the better of the castings, I would advise installing steel splayed four bolt caps and a steel two bolt front cap ( you would have pan clearance problems with a 4 bolt front cap), Also after line boring the block I recommend finish sizing the main bores with a line hone, The main bearing heat transfer is greater with the smoother finishbores. Hope this helps.speedracer119 wrote:i hear that there is a problem with the 4-bolt 400 SBC what is it? thanks.
Like it has been said the 509 has more nickel. I have seen many 4-bolts with the the crank removed with some of the cap still torked and in place because the block broke. I would suggest not running it with nitrous or high compression seems when both are involved that is when we have seen the cylinders cracked or the mains broke.I know a guy a while back that thought he came on to the mother load while buying a machine shop out he got a bunch of untouched 400s and all had cracked cylinders.Just don't get all down if you have problems. We look at it as; if it last a season you did good. Just my 2 cents.Jason
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